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authorCarl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>2008-12-23 17:20:46 +0000
committerCarl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net>2008-12-23 17:20:46 +0000
commit33f9633184ddc84151ab3685725d13448cdec232 (patch)
treec10a199a36ba2e47da3a8465dc033ce045778a58 /src/southbridge/amd
parent5a3c8462dcd0335a0e7f950b9c91af636a727a7a (diff)
Handle RS690 quirks for 1 GHz noncoherent HyperTransport.
The RS690 chipset has a problem where it will not work with 1 GHz HT speed unless NB_CFG_Q_F1000_800 bit 0 is set. Tested, works on my Asus M2A-VM with an 1 GHz HT capable processor. Signed-off-by: Carl-Daniel Hailfinger <c-d.hailfinger.devel.2006@gmx.net> Bao, Zheng says: As a matter of fact, both 600Mhz and 1Ghz have their own specific setting. This patch has been tested on dbm690t which HT link works on 800Mhz. Acked-by: Peter Stuge <peter@stuge.se> git-svn-id: svn://svn.coreboot.org/coreboot/trunk@3839 2b7e53f0-3cfb-0310-b3e9-8179ed1497e1
Diffstat (limited to 'src/southbridge/amd')
-rw-r--r--src/southbridge/amd/rs690/rs690_early_setup.c22
1 files changed, 19 insertions, 3 deletions
diff --git a/src/southbridge/amd/rs690/rs690_early_setup.c b/src/southbridge/amd/rs690/rs690_early_setup.c
index 08ce2515c4..d253f0d868 100644
--- a/src/southbridge/amd/rs690/rs690_early_setup.c
+++ b/src/southbridge/amd/rs690/rs690_early_setup.c
@@ -2,6 +2,7 @@
* This file is part of the coreboot project.
*
* Copyright (C) 2008 Advanced Micro Devices, Inc.
+ * Copyright (C) 2008 Carl-Daniel Hailfinger
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@@ -175,8 +176,9 @@ static void rs690_htinit()
/*
* About HT, it has been done in enumerate_ht_chain().
*/
- device_t k8_f0;
+ device_t k8_f0, rs690_f0;
u32 reg;
+ u8 reg8;
u8 k8_ht_freq;
k8_f0 = PCI_DEV(0, 0x18, 0);
@@ -195,7 +197,22 @@ static void rs690_htinit()
************************/
reg = pci_read_config32(k8_f0, 0x88);
k8_ht_freq = (reg & 0xf00) >> 8;
- printk_info("rs690_ht_init k8_ht_freq=%x.\n", k8_ht_freq);
+ printk_spew("rs690_htinit k8_ht_freq=%x.\n", k8_ht_freq);
+ rs690_f0 = PCI_DEV(0, 0, 0);
+ reg8 = pci_read_config8(rs690_f0, 0x9c);
+ printk_spew("rs690_htinit NB_CFG_Q_F1000_800=%x\n", reg8);
+ /* For 1000 MHz HT, NB_CFG_Q_F1000_800 bit 0 MUST be set.
+ * For any other HT frequency, NB_CFG_Q_F1000_800 bit 0 MUST NOT be set.
+ */
+ if (((k8_ht_freq == 0x6) || (k8_ht_freq == 0xf)) && (!(reg8 & 0x1))) {
+ printk_info("rs690_htinit setting bit 0 in NB_CFG_Q_F1000_800 to use 1 GHz HT\n");
+ reg8 |= 0x1;
+ pci_write_config8(rs690_f0, 0x9c, reg8);
+ } else if ((k8_ht_freq != 0x6) && (k8_ht_freq != 0xf) && (reg8 & 0x1)) {
+ printk_info("rs690_htinit clearing bit 0 in NB_CFG_Q_F1000_800 to not use 1 GHz HT\n");
+ reg8 &= ~0x1;
+ pci_write_config8(rs690_f0, 0x9c, reg8);
+ }
}
/*******************************************************
@@ -462,7 +479,6 @@ static void rs690_early_setup()
break;
}
- rs690_htinit();
k8_optimization();
rs690_por_init(nb_dev);
}